Radial Magnetic Prime-Mover Mahesh Yashwant Chavan Shri Guru Gobind Singhji Institute of Engineering & Technology, Vishnupuri, Nanded, Maharashtra Abstract: The Radial Magnetic prime-mover is the mechanism which is designed to use for the power and speed magnification using property of permanent magnet and the suitable arrangement of magnets over the radial piston cylinder arrangement. This mechanism uses the magnetic flux density for its operation. The phenomenon of repulsion between two magnets creates the motion of piston in the mechanism. There is the outer repulsive ring, having permanent magnets attached to it in specific manner, rotates over the radial five piston cylinder mechanism powering all the piston in specific manner so as to magnify the speed six times. One revolution of outer repulsive ring makes the six revolution of output shaft. Due to use of strong permanent magnets over piston and ring, there is also torque magnification. The project includes the CAD design of this mechanism, unique design of outer ring for particular odd number of cylinder, stimulation of mechanism and prototyping. The outer repulsive ring can be operated manually or can be powered by dc motor, water energy or by any other means like belt. It can be used as electricity generator, for power magnification in water turbine and transmission system. Keywords: Permanent magnet, repulsive ring, piston, cylinder, radial magnetic mechanism, water turbine, power transmission, speed magnification, high speed ratio, rotating magnets, magnetic engine. 1. Introduction battery when it is used for generator. In case of water turbine the pelton wheels can attached to the outer repulsive ring. Shortage of fossil fuels, the associated costs, noise, low And in case of power transmission belt can be attached to the efficiency and pollution effects are some major demerits of repulsive ring. IC engine operated electricity generator. So, it is inevitable to use the other alternative energy resources such as Renewable The main advantage of this mechanism is pollution free, easy energy, Green energy, stored energy that can reduce the to design and economical. Further, due to the principle of its pollution drastically. Solar panels have low efficiency and operation, it uses low power or small force to generate very small home generator have noise and pollution problems. high power or large force. With diminishing fossil fuel resources and unabated increase 2. Working Principle in energy costs and environmental concerns, engine using alternate energy sources such as bio fuel, solar power, wind The working principle of magnetic radial engine is based on power, electric power etc. are being developed around the the principle of magnetism of permanent magnet. A magnet world. However such engine has limitations. Production of has two poles a north pole and a south pole. Magnetism is a bio-fuel takes enormous resources and they still pollute class of physical phenomenon that includes forces exerted by environment. They do not meet increasing energy demand as magnets. By principle of magnetism, when like poles of well. Similarly the solar power is not efficient. Here the new magnet are brought together they repel and when unlike poles concept, Radial Magnetic Prime-mover, is introduced are brought near to each other they attract. The repulsive which is having more efficiency for transmitting power and power of permanent magnet is used to power the pistons in can replace IC engine generator. It's an mechanism works on radial engine. So the idea is to modify the piston head and principle of magnetic flux density. This provides an cylinder head with some suitable attachment of magnets so ecofriendly, very high efficiency mechanism. that forces can be generated to power the piston and hence the engine. The permanent magnets are arranged in such a Magnetism is the basic principle of working like radial way that they repel the magnets attached to five pistons in engine with five piston cylinders. The pistons are having specific order to give the uniform output power. permanent magnet. The general property of the magnet i.e. attraction forces is converted into mechanical work. A magnet has two poles, a north pole and a south pole. When like poles are brought near each other they repel and attract when like poles brought together. In this mechanism, all the five pistons are repelled by the outer repulsive ring. The mechanism should ideally perform exactly same as the radial IC ENGINE. The power of the engine is controlled by the rotating speed of outer repulsive ring. If the speed increases the power generated by the engine also increases accordingly. The repulsive ring can be attached to the motor that takes power from DC source like lead acid battery. It may attach to the solar panel for charging Figure 1: Property associated with magnets 175
The engine greatly resembles the four stroke five cylinder radial IC engine as shown in fig 2. The Outer repulsive ring (ORR) is attached to the DC motor that is connected to battery. Battery may attach to a solar panel for recharging purpose. To start, let us begin from situation when piston 1 is at upper position i.e. top dead center (TDC). When piston 1 is at TDC the outer ring is in such a position that magnet1 is aligned with the magnet on piston1. As both magnets in piston and ring are of same polarity, a repulsive force is exerted by ring on piston causing the piston to move downwards. This movement of piston1 causes a crank rotation of 144 degrees. At same instant piston3 reaches TDC and magnet2 attached to ring faces the piston3. Piston3 gets repelled by magnet2. After 144 degree revolution of crankshaft piston5 reaches TDC and magnet3 attached to ring Figure 3: Five position at the time of repulsion in one faces piston5. Piston5 get repel by magnet3 and go down to revolution bottom dead center (BDC). Then piston2 and piston4 also get repelled by magnet1 and magnet2 respectively. This one cycle rotates the repulsive ring in 120 degree and crankshaft gets rotated through 720 degree (i.e. two revolutions) as shown in fig 3. Figure 4: Schematic diagram of position of magnet on Figure 2: View of RMP. 3 magnets on outer repulsive ring ORR and 5 magnets on 5 piston head In fig 4 every circle denotes the position of magnet on ORR When repulsive ring completes its 1/3 rd revolution all five after every successive 24 degree rotation of ORR. This pistons make their four strokes. At this time, crank-shaft mechanism behaves like a four stroke radial IC engine. After completed its two revolutions. Now next situation comes 120 degree revolution of ORR all five piston have when (ORR have completed 120 degree revolutions) reciprocated from TDC to BDC hence making the two magnet3 is on the surface of piston1 same cycle repeats revolution of crankshaft (o/p shaft). So here 360 revolution (again two revolution of crankshaft) until magnet2 reaches of ORR makes the 6 revolution of output shaft. piston1. When piston2 starts moving same cycle makes two revolutions of crank shaft. At the end magnet1 comes to its 3. Component Design original position and at this instant crank shaft have been completed the six revolutions. one revolution of repulsive All the components of radial magnetic prime-mover is plate produces six revolution of crankshaft designed and assembled in the Solidworks 2014 software. Motion study of the whole mechanism is also done in the The permanent magnets are attached to repulsive ring in such same software. The results of it are same as per theoretical a way that it repels the magnet attached to five pistons in the assumptions. order 13524 same as that in the Radial IC engine. The speed and force exerted on piston by outer ring magnets is directly proportional to speed at which ring revolves. The output torque also depends on size of magnet used. Speed of outer ring is controlled by CRO for testing the maximum efficiency. We come to know that the magnetic field produced is inversely proportional to the time required to complete revolution by outer ring. 176
boundaries of cylinder periphery. Usage of aluminum or plastic makes engine lighter. 3.2 Piston The hollow piston casing is made up of aluminum of high resistivity and low electrical conductivity. One end of the hollow case is fitted with a powerful neodymium-iron-boron magnet having high field strength. The permanent magnet acts as core of the piston. The flat surface of the piston head completely exposed. The other end of the piston connected to connecting rod which connects to the crankshaft. The crankshaft and piston converts linear reciprocating motion of the piston to circular motion. 3.3 Connecting rod In a reciprocating engine, the connecting rod is used to connect the piston to the crankshaft. It converts the linear motion or reciprocating motion of the piston to the circular motion of the crankshaft. The material of the connecting rod is cast iron. As the magnetic fields are contained inside the cylinder, the connecting rod will not be affected much. The connecting rod is same as that of an Internal Combustion engine. 3.4 Connecting rod hub Figure 5: front and side view of RMP This is a circular part which is connected to the all five pistons through the five connecting rods. Hub is attached to the dead weight of crankshaft at point 20mm apart from shaft. Table 1: Components in RMP 3.5 Permanent magnet No. Description 1 Neodymium Permanent Magnet In this system, a permanent neodymium iron-boron magnet 2 Five Cylinder Casing was adhered to the top surface of each piston. Hence the 3 Connecting Rod magnet travelled along with the piston with reciprocating 4 Connecting Rod Hub 5 Crankshaft motion. Three magnets are attached to the outer repulsive 6 Repulsive Ring ring 120 degree apart. It is cylindrical in shape having 40mm 7 Piston diameter and 20mm thickness. 8 Shaft Bearing Plate 9 Output Shaft To Alternator Magnetism is a phenomenon where a force arises between 10 TDC magnets and objects, creating a magnetic field around, which 11 BDC in turn may create a repulsive or attractive force. The fields 12 Motor indicate values of strength as well as in the directions they 13 Bearing Support are acting. Magnets are dipoles in nature, i.e., one face 14 Motor Linkage To Outer Ring possess a north pole, and the other south. Permanent magnet is an object made from material that is magnetized and 3.1 Cylinder creates its own persistent magnetic field. Main way the permanent magnet created is by heating ferromagnetic This mechanism uses five cylinders for operation arranged in material to a key high temperature. The temperature is same manner as like in radial engine. The cylinder must resist specific to each kind of metal, but has the effect of fixing and unwanted magnetic field and other losses. Further, cylinder aligning the domains of the magnet in the permanent material should not get attracted to the magnet. To take care position. It is conjectured that this same process inside the this issues, the cylinder only made up of none magnetic earth is what creates natural permanent magnets. Ceramic, material such as stainless steel, aluminum, titanium having Alnico, Samarium, Cobalt, Neodymium Iron Boron, Injection high resistivity and low electrical conductivity. The molded and Flexible are the types of magnets. temperature generated during the process is very low because of that no fins required for heat transfer. Because of that engine can easily manufacturable. Aluminum and nonmagnetic material limits the magnetic field within the 177
3.6 Repulsive ring Torque = force X crank length = 5.17 Nm. The repulsive ring is one of the most important element in the magnetic radial engine, since this assists in repelling the like This is no load maximum torque. poles of the magnets. This ring rotates over the five cylinder casing. The permanent magnets are attached to repulsive ring There is no torque loss in the mechanism, though by in such a way that it repels the magnet attached to five considering minimum torque of 4Nm pistons in specific order (13524). The material used for the construction of this ring is very critical. It must be made up Speed of motor is 30 rpm. Radial magnetic Prime-mover of nonmagnetic material which should not affected by the gives the speed ratio of 1:6. Therefore the speed of magnetic field produced by the magnets attached to pistons crankshaft (output shaft) of mechanism is 180rpm. and the ring itself. Any material like stainless steel, aluminum etc. can be used. High density plastic is also a good option At 180 rpm, which reduced weight of assembly. In addition to proper selection of the materials, proper construction is also Power = 2 πnt/60 important. This repulsive ring is designed in such a way that = 97.47watt. it can slide on the five cylinder casing. (Repulsive ring is also designed for any odd number magnetic radial engine.) Selection of motor for given specification of mechanism 4. Calculation Material of outer ring ABS (Acrylonitrile Butadiene styrene) Case 1 Density 913 Kg/m 2. As shown in fig.5, a dc motor powered by solar panel is Volume used for ring π (D 2 -d 2 ).l rotating the outer repulsive ring. D = outer diameter of ring = 0.355m Input conditions for motor - D = inner diameter of ring = 0.29m Voltage 12V DC Current - 6.5 A Substituting values, RPM 30 Volume = 2.09 X 10-3 m 3. Torque 2 Nm. Mass of ring = volume X density Input power = Voltage X Current = 1.91Kg. = 12 X 8 Mass of one magnet = 150gm. = 96 W. Mass of three magnets = 450gm. Repulsive ring consist of three magnets Specifications: Total mass (M) = 2.36Kg. Magnet - neodymium magnet Diameter (D) 40mm Moment of inertia (I) = 0.5 X M X (R 2 + r 2 ) Radius (R) 20mm = 0.248Kgm 2. Thickness (T) 20mm Grade N5014 Angular velocity, Remance field (Br) 1.42T w1 = 0 Z distance between the magnet in ring and in the piston w2 = (2 π.n)/60 3mm = 20.9 rad/sec B = Br /2 X [ (T+Z)/((R 2 +(T+Z) 2 ) 0.5 -Z/(R 2 +Z 2 ) 0.5 ] [7] Substituting all the values B = 0.4304 T. Force calculations Pole strength (M)wb = B X area = B X π/4(r 2 ) = 5.41X 10-4 wb Force of repulsion between two magnets F = M1M2 / μ0 Z 2 M1, M2 - pole strength of two magnets μ0 = Permeabity of medium = 4π X 10-7 Wb/A.m Substituting values we get, F = 258.57 N Crank length = 20mm Angular velocity, α = (w2-w1)/t t- time require to accelerate the ring = 4 sec. α = 20.9/4rad/sec 2. Torque = I.α = 1.3Nm This is the torque require to accelerate the total mass of outer ring. Thus the dc motor is of 2Nm torque. This torque is not sufficient to rotate the ORR. Due to load on output shaft more torque require to rotate it. Case 2 Considering the RMP is used in the pelton wheeled water turbine. The pelton wheel is attached to the ORR as shown in fig.8. pelton wheel configuration 178
Mean bucket diameter (D) 100cm Net head on pelton wheel (H) 700m Side clearance angle (β) 15 degree Discharge through nozzle (Q) 0.1 m 3 /sec Speed of wheel 1000rpm Tangential velocity of wheel (u)= (πdn)/60 5206m/s Velocity of jet at inlet = v1 = Cv(2gH) 0.5. For pelton wheel, Cv = 1 V1 = 117m/s. Water power = (ρghq)/1000 =686.72kW. Hydraulic efficiency of pelton wheel is given by, ηh = [2(v1-u)(1*cosβ)u]/v1 2 [4] substituting all the values we get, ηh = 97.1%. ηh = runner power / water power. Runner power = 0.97 X 686.7 = 666kW. Shaft power, It is power available at output shaft of RMP Having same configuration of magnets in RMP Graph 1: force of repulsion vs size of magnet 5. Application of mechanism 5.1 Generator This mechanism can be used as small generator for house by using the dc motor for driving it. Solar panel is used for powering the dc motor. The speed of dc motor is controlled by the CRO or any other controller. The calculation in the case1 is for the dc motor operated generator. Rpm of output shaft = 6 X pelton wheel rpm = 6 X 1000 = 6000 rpm. Power = 2 πnt/60 = 609.5kW. Mechanical efficiency = 666/ 609.5 = 0.915 = 91.5% This is the output power by considering the minimum output torque attained by RMP. By using the big size, strong magnet output torque of RMP increases. This makes the efficiency tending to or exceeding unity. Figure 6: 3d view of RMP with dc motor attached to ORR This implies that because of use of repulsive power of 5.2 Water turbine permanent, there is some power magnification in RMP. The water is the rotary machine which converts the kinetic energy and potential energy of water into mechanical work. Flowing water is directed on to the blades of a turbine runner, creating a force on the blades. Since the runner is spinning, the force acts through a distance (force acting through a distance is the definition of work). In this way, energy is transferred from the water flow to the turbine. Graph 1: force of repulsion vs distance between two magnets 179
Figure 9: Power transmission by belt. RMP can also use in the belt drive transmission system as shown in fig. 9. In transmission many times we need the Figure 7: water turbine with pelton wheel torque magnification which is done by the speed reduction, like we use reduction box for more torque. We need to These mechanism of Radial Magnetic Prime-mover can also reduce the speed for more torque. We can achieve the more be used in the water turbine for power magnification. It can torque even at high speed by introducing the RMP in the more easily attach to the pelton wheel turbine as shown in system. This five piston cylinder RMP give the speed ratio of fig. 7. The Pelton wheel extracts energy from the impulse of 1:6 with minimal loss of torque moving water. Conventional water turbine is having the less efficiency. Instead of connecting the pelton wheel directly to generator through shaft, it can be connected through Radial Magnetic Prime-mover. The pelton wheels are attaché to the the outer repulsive ring. When water rotates the wheel, it thereby rotates the ORR. As the function of Radial Magnetic Prime-,over, it magnifies the power. Figure 10: RMP used in the belt power transmission system. 6. Further study The study of Radial Magnetic Prime-over is not limited to the radial five cylinder mechanism. The speed and power magnification can also be achieved in three and seven cylinder mechanism using the unique arrangement of magnets on ORR for respective mechanisms. Figure 8: Water turbine with pelton wheel attached to the ORR of RMP. Speed magnification of 1:4 is achieved in radial 3 cylinder mechanism by placing 4 permanent magnets on ORR at exactly 90 degree to each other. 5.3 Power transmission Many systems used for the power transmission like gear train, belt drive, chain drive etc. In most mechanical system belt drive is used for the power transmission. In CVT (Continuously Variable Transmission) belt drive is used along with the movable pulleys for various speed ratios. Figure 11: Radial Magnetic three cylinder mechanism 180
Speed magnification of 1:10 is achieved in radial 7 cylinder IC engine operated generator. This is the only arrangement of mechanism by placing 5 permanent magnets on ORR at magnet in outer repulsive ring in odd number of cylinder exactly 72 degree to each other. magnetic radial mechanism. Innovation is applied to any odd number of cylinder magnetic radial engine. By using the large size permanent magnet, the more torque magnification can achieve. The efficiency of mechanism increases with the increase in speed of ORR. With the keen manufacturing of all parts of system and some testing on it, this mechanism will give the good results. Some detailed study about the behavior of permanent magnets is being required, which is the future scope of this paper. Further improvements of the current technology can help its progress and implementation in current systems. References Figure 12: Radial Magnetic seven cylinder mechanism [1] Sumit dhangar, MAGNETIC PISTON OPERATED ENGINE ; IJARSE, Vol. No.4, Issue 06, June 2015. 7. Prototype [2] Ajinkya Dharia, Magnetic Engine ; IJSR Volume 4 Issue 12, December 2015 The prototype of radial five cylinder mechanism magnetic [3] Radhakrishna Shesha Iyengar Togare; Magnetic Pistons prime-mover is for testing purpose. Prototype is fabricated on Engine; 2010;US 7,667,356 B2. the scale of 1:2. The ORR is made up of aluminum sheet. [4] MentaSudheer, KonduruVasu and Kalahsti Sirisha Vamsi, Piston, connecting rod and hub are made from plastic Magnetic Piston Engine, IJMERR, 2014 material. [5] R. K. Bansal ; fluid dynamics and turbo machines [6] S.S. Rattan; Tata McGraw-Hill Education; Theory of machines. [7] http://www.wikipidea.org/wiki/forces between magnets. [8] https://www.kjmagnetics.com. Author Profile Mahesh Chavan has received the B.Tech degree in Mechanical Engineering from Shri Guru Gobind Singhji Institute of Engg. & Tech., Vishnupuri Nanded, 431606 [M.S.], India Definition/Abbreviations RMP Radial Magnetic Prime-mover ORR Outer Repulsive Ring IC ENGINE - INTERNAL COMBUSTION ENGINE TDC - Top dead center BDC - Bottom dead center. Figure 13: Prototype of Radial Magnetic Prime-mover 8. Conclusion This mechanism gives the 1:6 speed ratio with less loss of torque. It can be used as generator, water turbine and in the transmission of vehicle.. As there is no combustion taking place inside the cylinder there is only very little heat generation. By the use of materials like Aluminum, plastic etc. we can reduce the weight of the mechanism. Less noise is produced during its working which is one of disadvantage of 181